I used to use ChompSMS for a long time but then I discovered Textra. Which, btw, are both from the same developer. The main reason I switched was because I felt that ChompSMS was a little bloated. I don't remember exactly what I didn't like other than that extra chat service or whatever it is that they added. I saw that Textra was from the same developer & I knew that they produced a reliable app so I decided to give it a try. I never really thought about it but @Nyvideo is right, Textra's notification pop-up is less intrusive than ChompSMS.